* {
    margin: 0px;
}

.img0jpg {
    vertical-align: bottom;
}

.navbar-aa {
    padding: 5px;
}

.section {
    width: 100%;
    height: 915px;
    background: url(../img/99.jpg);
    background-size: cover;
    position: relative;
}

.jumbotron {
    background: none;
    color: white;
    padding-left: 37%;
}

.jumbotron>p {
    margin-left: 50px;
}

.mulu {
    width: 990px;
    height: 250px;
    margin-left: 26%;
    margin-top: 10%;
}

.mulu li {
    list-style: none;
    width: 200px;
    height: 250px;
    margin-left: 10px;
    background-color: rgba(255, 255, 255, 0.5);
    float: left;
    border-radius: 5px;
    padding-left: 25px;
    padding-top: 10px;
    box-sizing: border-box;
    cursor: pointer;
    position: relative;
}

.mulu li:active {
    margin: 5px 0px 0px 10px;
}

.mulu li>p {
    position: absolute;
    top: 165px;
    left: 0px;
    width: 200px;
    height: 50px;
    font-size: 20px;
    font-weight: 600;
    line-height: 50px;
    text-align: center;
}

.mulu li:hover {
    color: white;
}

#img30png {
    background-image: url(../img/30.png);
    background-repeat: no-repeat;
    background-size: 150px 150px;
    background-position: 25px 10px;
}

#img30png:hover {
    background-image: url(../img/34.png);
    background-repeat: no-repeat;
}

#img31png {
    background-image: url(../img/31.png);
    background-repeat: no-repeat;
    background-size: 150px 150px;
    background-position: 25px 10px;
}

#img31png:hover {
    background-image: url(../img/36.png);
    background-repeat: no-repeat;
}

#img32png {
    background-image: url(../img/32.png);
    background-repeat: no-repeat;
    background-size: 150px 150px;
    background-position: 25px 10px;
}

#img32png:hover {
    background-image: url(../img/37.png);
    background-repeat: no-repeat;
}

#img33png {
    background-image: url(../img/33.png);
    background-repeat: no-repeat;
    background-size: 150px 150px;
    background-position: 25px 10px;
}

#img33png:hover {
    background-image: url(../img/35.png);
    background-repeat: no-repeat;
}

.section_firstbox {
    width: 470px;
    height: 400px;
    background-color: rgba(255, 255, 255, 0.3);
    position: absolute;
    top: 20%;
    left: 37%;
}

.section_firstbox>p {
    position: absolute;
    top: 70px;
    left: 130px;
    width: 200px;
    height: 50px;
    font-size: 24px;
    font-weight: 600;
    line-height: 50px;
    text-align: center;
}

#section_firstbox_img1 {
    width: 40px;
    height: 40px;
    background: url(../img/denglu.png);
    background-size: 40px 40px;
    background-repeat: no-repeat;
    display: inline-block;
    position: absolute;
    top: 140px;
    left: 80px;
}

#section_firstbox_img {
    width: 40px;
    height: 40px;
    background: url(../img/mima.png);
    background-size: 40px 40px;
    background-repeat: no-repeat;
    display: inline-block;
    position: absolute;
    top: 210px;
    left: 80px;
}

.section_firstbox_denglu {
    width: 230px;
    height: 35px;
    position: absolute;
    top: 144px;
    left: 125px;
    border: none;
    border-radius: 5px;
}

.section_firstbox_mima {
    width: 230px;
    height: 35px;
    position: absolute;
    top: 214px;
    left: 125px;
    border: none;
    border-radius: 5px;
}

.section_firstbox_button {
    width: 230px;
    height: 35px;
    position: absolute;
    top: 284px;
    left: 125px;
    border: none;
    background-color: rgba(0, 0, 0, 0.5);
    color: #fff;
    text-align: center;
    font-size: 16px;
    font-weight: 600;
}

.section_firstbox_button:active {
    border: solid white 1px;
}
.nav li:hover{
	background:black;
}